CN217682581U - Hydraulic cylinder - Google Patents

Abstract

The utility model relates to a hydraulic cylinder, which comprises a cylinder barrel and a piston rod, wherein the cylinder barrel is provided with a buckling part; the piston rod is in the hydraulic pressure chamber of cylinder along the flexible activity of the axial of cylinder to have the extension position that is located the activity stroke both ends, and the shrink position, the piston rod corresponds the buckling parts and is equipped with the cooperation portion, and when the piston rod moved towards the shrink position, the buckling parts can with cooperation portion lock, in order to restrict the piston rod shrink, and when the piston rod moved towards the extension position, the buckling parts broke away from with cooperation portion. The pneumatic cylinder that this scheme provided has avoided losing efficacy because of check valve system, and makes the condition of pneumatic cylinder withdrawal take place under the heavy pressure of driver's cabin, has improved the security performance of pneumatic cylinder, has reduced the risk factor, and has guaranteed the convenience of its use.

Description

Hydraulic cylinder

Technical Field

The utility model relates to the field of hydraulic techniques, especially, relate to a pneumatic cylinder.

Background

The current trend in trucks is the flathead automobile, which places the engine under the cab so that the cab needs to be lifted when the engine is serviced. At present, a turning hydraulic cylinder is generally arranged below a cab to realize turning lifting and descending actions of the cab of a truck, so that maintenance of an engine and the like is facilitated.

The existing hydraulic cylinder is generally of a pure hydraulic type, and when a piston rod extends to the longest or retracts to the shortest, the piston rod is limited by the internal structure of the hydraulic cylinder. Specifically, usually after the cab is lifted to the right position, the hydraulic cylinder is stopped to act, and the sealing of an oil way is ensured by a one-way valve system in the hydraulic cylinder, so that the piston rod of the hydraulic cylinder is ensured not to retract, namely, the cab does not automatically fall back.

For example, patent CN 1786490A discloses a safety device of a hydraulic cylinder, which achieves the limit of a piston rod through a one-way valve. So, when the oil circuit blocks up and leads to check valve system to become invalid, the pneumatic cylinder can be in the heavy pressure of driver's cabin and retract, has great safety risk, endangers personal safety.

SUMMERY OF THE UTILITY MODEL

In view of this, a need exists for a hydraulic cylinder, which is used to solve the technical problem in the prior art that a check valve system fails due to the blockage of an oil path, the hydraulic cylinder retracts under the heavy pressure of a cab, and a large safety risk exists, thereby endangering the personal safety.

The utility model provides a hydraulic cylinder, this hydraulic cylinder includes:

a cylinder barrel provided with a buckling part; and (c) a second step of,

the piston rod stretches and retracts along the axial direction of the cylinder barrel and moves in the hydraulic cavity of the cylinder barrel so as to have an extension position and a retraction position which are positioned at two ends of a movement stroke, the piston rod is provided with a matching part corresponding to the buckling part, when the piston rod moves towards the retraction position, the buckling part can be buckled with the matching part so as to limit the retraction of the piston rod, and when the piston rod moves towards the extension position, the buckling part is separated from the matching part.

Optionally, the matching part comprises a limiting plate and a mounting plate bent from one end of the limiting plate, the mounting plate is connected with the piston rod, the limiting plate is located on the outer side of the cylinder barrel and is arranged along the axial direction of the cylinder barrel, and a limiting hole penetrates through the limiting plate towards the cylinder barrel;

the buckling part comprises a buckling piece located on the inner side of the limiting plate, the buckling piece is arranged corresponding to the limiting hole and is arranged on the periphery of the cylinder barrel in a rotating mode around the width direction of the limiting plate, an elastic resetting piece is arranged between the buckling piece and the cylinder barrel, and the elastic resetting piece can be used for driving the buckling piece to rotate into the limiting hole;

when the piston rod moves towards the contraction position to the position, corresponding to the limiting hole, of the buckling piece, the elastic resetting piece drives the buckling piece to rotate to the position, connected in the limiting hole in an inserting mode, and when the piston rod moves towards the extension position, the limiting plate can drive the buckling piece to rotate to the position, separated from the limiting hole.

Optionally, the distance between the contraction position and the extension position is S, the length of the limiting plate is L0, and S is less than or equal to L0;

when the piston rod is in the contraction position, the distance between the limiting hole and the buckling piece is L1, and L1 is larger than or equal to 0.5S and smaller than or equal to S.

Optionally, the limiting hole is provided with a plurality of limiting holes, and the plurality of limiting holes are arranged at intervals along the axial direction of the piston rod.

Optionally, the arrangement length of the plurality of limiting holes is L2, and L2 is greater than or equal to 0.3S and less than or equal to 0.5S.

Optionally, the buckling part further comprises a driving handle, the driving handle is in driving connection with the buckling part and located on the lateral side of the limiting plate in the width direction, and the driving handle is used for driving the buckling part to rotate when external force is applied.

Optionally, the mounting plate is rotatably connected to the piston rod around the width direction thereof;

the periphery of the cylinder barrel is provided with a limiting frame corresponding to the limiting plate, the limiting frame is arranged at two openings in the axial direction of the piston rod to form a limiting channel, and the limiting plate penetrates through the limiting channel.

Optionally, a retraction limiting block is arranged at one end of the piston rod, which is far away from the cylinder barrel;

the periphery of the cylinder barrel corresponds to the contraction limiting block and is provided with a contraction touch sensor, and when the piston rod is located at the contraction position, the contraction touch sensor is in contact with the contraction limiting block to output a contraction limit signal.

Optionally, the limiting plate is provided with an extension limiting block;

an extension touch sensor is arranged on the periphery of the cylinder barrel corresponding to the extension limiting block, and when the piston rod is located at the extension position, the extension touch sensor is in contact with the extension limiting block to output an extension limit signal;

when the piston rod is at the contraction position, the distance between the extension limiting block and the extension touch sensor is L3, the distance between the contraction position and the extension position is S, and S = L3.

Optionally, the elongate touch sensor comprises:

the limiting rod is provided with a driving end and a touch end and is rotatably arranged on the periphery of the cylinder barrel, and the driving end is arranged corresponding to the extension limiting block;

the touch sensor is arranged on the periphery of the cylinder barrel, corresponds to the touch end and is used for outputting an extension limit signal when the touch sensor is touched, and the extension limiting block drives the limiting rod to rotate when the piston rod moves towards the extension position so that the touch end rotates to touch the touch sensor; and the number of the first and second groups,

the elastic resetting piece is arranged between the touch end and the touch sensor and used for enabling the touch end to reset from the position close to the touch sensor to the position far away from the touch sensor.

Compared with the prior art, the hydraulic cylinder provided by the utility model has the advantages that after the piston rod extends in place, the buckling part is buckled with the matching part to limit the contraction of the piston rod, so that the condition that the check valve system fails due to the blockage of the oil way and the hydraulic cylinder retracts under the heavy pressure of a cab is avoided, and the safety performance is improved; in addition, when the piston rod extends, the buckling part can be separated from the matching part, so that the normal lifting function of the hydraulic rod is not influenced. Therefore, the safety performance of the hydraulic cylinder is improved, the risk factors are reduced, and meanwhile the convenience of use of the hydraulic cylinder is guaranteed.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, and to implement the technical means in accordance with the content of the description, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic structural diagram of an embodiment of a hydraulic cylinder provided by the present invention;

FIG. 2 isbase:Sub>A schematic partial cross-sectional view taken along plane A-A of FIG. 1;

fig. 3 is a schematic top view of the hydraulic cylinder of fig. 1.

Description of reference numerals:

100-hydraulic cylinder, 1-cylinder barrel, 11-buckling part, 111-buckling part, 112-driving handle, 12-elastic resetting part, 13-limiting frame, 14-contraction touch sensor, 15-elongation touch sensor, 151-limiting rod, 1511-driving end, 1512-touch end, 152-touch sensor, 153-elastic resetting part, 2-piston rod, 21-matching part, 211-limiting plate, 211 a-limiting hole, 212-mounting plate, 22-contraction limiting block and 23-elongation limiting block.

Detailed Description

The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.

Referring to fig. 1 to 3, the hydraulic cylinder 100 includes a cylinder barrel 1 and a piston rod 2, wherein the cylinder barrel 1 is provided with a buckling part 11; the piston rod 2 is extended and retracted along the axial direction of the cylinder barrel 1 and moves in the hydraulic cavity of the cylinder barrel 1 so as to have an extension position and a retraction position which are positioned at two ends of a movement stroke, the piston rod 2 is provided with a matching part 21 corresponding to the buckling part 11, when the piston rod 2 moves towards the retraction position, the buckling part 11 can be buckled with the matching part 21 so as to limit the retraction of the piston rod 2, and when the piston rod 2 moves towards the extension position, the buckling part 11 is separated from the matching part 21.

The utility model provides a pneumatic cylinder 100 is after piston rod 2 extends to target in place, buckling part 11 and cooperation part 21 looks lock to restrict piston rod 2 and shrink, avoided because of the oil circuit blocks up and lead to the fact check valve system to become invalid, and make pneumatic cylinder 100 take place under the condition that the heavy pressure of driver's cabin withdraws, improve the security performance; further, since the engaging portion 11 can be disengaged from the engaging portion 21 when the piston rod 2 is extended, the normal lifting function of the hydraulic rod is not affected. Therefore, the scheme improves the safety performance of the hydraulic cylinder 100, reduces the risk factors and ensures the convenience of use.

Further, referring to fig. 2 and fig. 3, in the present embodiment, the matching portion 21 includes a limiting plate 211 and a mounting plate 212 bent from one end of the limiting plate 211, the mounting plate 212 is connected to the piston rod 2, the limiting plate 211 is located at the outer side of the cylinder barrel 1 and is disposed along the axial direction of the cylinder barrel 1, and the limiting plate 211 penetrates a limiting hole 211a toward the cylinder barrel 1; the buckling part 11 comprises a buckling piece 111 positioned on the inner side of the limiting plate 211, the buckling piece 111 is arranged corresponding to the limiting hole 211a and is arranged on the periphery of the cylinder barrel 1 in a rotating manner around the width direction of the limiting plate 211, an elastic resetting piece 12 is arranged between the buckling piece 111 and the cylinder barrel 1, and the elastic resetting piece 12 can be used for driving the buckling piece 111 to rotate into the limiting hole 211a; when the piston rod 2 moves towards the contraction position to the position where the buckling piece 111 corresponds to the limiting hole 211a, the elastic resetting piece 12 drives the buckling piece 111 to rotate to the position where the buckling piece is inserted into the limiting hole 211a, and when the piston rod 2 moves towards the extension position, the limiting plate 211 can drive the buckling piece 111 to rotate to the position where the buckling piece is separated from the limiting hole 211 a.

According to the scheme, the buckling piece 111 is matched with the limiting hole 211a to limit the contraction of the piston rod 2, and specifically, after the piston rod 2 extends in place, the elastic resetting piece 12 drives the buckling piece 111 to rotate to the position extending into the limiting hole 211 a. At this time, if the piston rod 2 tends to contract, the fastener 111 interferes with the limiting plate 211, so as to achieve the purpose of limiting the contraction of the piston rod 2. And when the telescopic link continued to extend, limiting plate 211 can drive buckling piece 111 antiport, also made elasticity reset 12 compression, buckling piece 111 breaks away from spacing hole 211a gradually this moment, avoids buckling piece 111 and limiting plate 211 to interfere and influence the action of lifting of piston rod 2, makes the utility model provides a pneumatic cylinder 100 safe and reliable, and convenient flexibility.

It is understood that the fasteners 111 may be provided in the form of fastening stems, or in other forms. Specifically, in the present embodiment, the snap 111 is provided in the form of a cam. In addition, the elastic restoring element 12 is not limited to be disposed, and may be disposed in a coil spring or in other forms as long as the elastic restoring element can drive the buckling element 111 to rotate around the width direction of the limiting plate 211 to the limiting hole 211 a. The resilient return member 12 is provided in this embodiment in the form of a torsion spring, making its drive more reliable and powerful.

Note that the inner side of the stopper plate 211 refers to the side thereof closer to the cylinder 1, and the outer side refers to the side thereof farther from the cylinder 1. And a ratchet can be arranged on one side of the limit plate 211 close to the cylinder barrel 1.

Since the cab is lifted to the highest position when the piston rod 2 is extended to the extreme position, if the check valve system fails at this time, the hazard is greatest. Therefore, in the embodiment, the distance between the retracted position and the extended position is S, the length of the limit plate 211 is L0, and S is less than or equal to L0; when the piston rod 2 is in the contraction position, the distance between the limiting hole 211a and the buckling piece 111 is L1, and L1 is more than or equal to 0.5S and less than or equal to S. That is, the distance between the contraction position and the extension position of the piston rod 2 corresponds to the length of the limiting plate 211, and it can be ensured that after the piston rod 2 extends to a half stroke, the piston rod is limited by the engagement of the fastener 111 and the limiting hole 211a, so as to reduce the retraction hazard after the piston rod 2 extends to the extreme position.

Furthermore, in order to expand the limit range of the expansion of the buckling member 111 on the piston rod 2, the range of the safe expansion of the piston rod 2 is larger. In this embodiment, the plurality of limiting holes 211a are provided, and the plurality of limiting holes 211a are arranged at intervals along the axial direction of the piston rod 2. Therefore, when the extension length of the piston rod 2 is within the arrangement length range of the limiting holes 211a, the piston rod 2 can be effectively prevented from retracting due to failure of the one-way valve system, and the safety performance of the piston rod is further improved.

Specifically, the arrangement length of the plurality of limiting holes 211a is L2, and L2 is greater than or equal to 0.3S and less than or equal to 0.5S. It can be understood that the plurality of position-limiting holes 211a are arranged at a distance from the position-limiting hole 211a near the side of the fastener 111 to the position-limiting hole 211a far from the side of the fastener 111. It should be understood that, when the arrangement length of the plurality of stopper holes 211a is too large, the strength of the stopper plate 211 may be reduced; when the arrangement lengths of the limiting holes 211a are too small, the safety hazards caused by the fact that the piston rod 2 extends to the extreme position cannot be better dealt with between the buckling piece 111 and the limiting holes 211 a. And when L2 is more than or equal to 0.3S and less than or equal to 0.5S, the strength of the limiting plate 211 is ensured, and the capability of dealing with potential safety hazards after the piston rod 2 extends to the extreme position is improved. In the present embodiment, L2=0.5S.

Further, movement of the piston rod 2 from the extended position to the retracted position is facilitated. In the present embodiment, the fastening portion 11 further includes a driving handle 112, the driving handle 112 is connected to the fastening member 111 in a driving manner, and is located at a lateral side of the position-limiting plate 211 in the width direction, for driving the fastening member 111 to rotate when an external force is applied. Specifically, when the piston rod 2 is retracted, an external force in a direction opposite to the driving direction of the elastic restoring member 12 is applied to the driving handle 112, so that the fastening member 111 reversely rotates against the elastic force of the elastic restoring member 12, and then disengages from the limiting hole 211a, and the position of the driving handle 112 is maintained until the fastening member 111 leaves the area of the limiting plate 211 where the limiting hole 211a is located. In the process, the pressure in the hydraulic cavity is reduced, so that the buckling piece 111 cannot stretch into the limiting hole 211a again in the retraction process of the piston rod 2, and the retraction efficiency of the piston rod 2 is improved.

Further, the mounting plate 212 is rotatably connected to the piston rod 2 about the width direction thereof; the periphery of cylinder 1 corresponds limiting plate 211 and is equipped with spacing frame 13, and spacing frame 13 sets up at 2 ascending both ends openings of axial of piston rod to form spacing passageway, during limiting plate 211 wears to establish spacing passageway. In this scheme, with mounting panel 212 and piston rod 2 rotation connection, specifically, rotate through the round pin axle between mounting panel 212 and the piston rod 2 and be connected, spacing frame 13 restriction limiting plate 211 of rethread is to the direction activity of keeping away from cylinder 1.

Furthermore, one end of the piston rod 2 far away from the cylinder barrel 1 is provided with a contraction limiting block 22; the periphery of cylinder 1 corresponds shrink stopper 22 and is equipped with shrink touch sensor 14, and when piston rod 2 was in the shrink position, shrink touch sensor 14 contacted with shrink stopper 22 to output shrink limit signal. Therefore, when the piston rod 2 is at the contraction position, the contraction touch sensor 14 is in contact with the contraction limiting block 22 and is triggered to send out a contraction limiting signal to inform an operator that the hydraulic cylinder 100 is contracted to the limiting position, so that damage caused by the fact that the hydraulic cylinder 100 is continuously in the contraction state is avoided.

Further, the limit plate 211 is provided with an extension limit block 23; an extension touch sensor 15 is arranged on the periphery of the cylinder barrel 1 corresponding to the extension limiting block 23, and when the piston rod 2 is at an extension position, the extension touch sensor 15 is in contact with the extension limiting block 23 to output an extension limit signal; when the piston rod 2 is at the retracted position, the distance between the extension stopper 23 and the extension touch sensor 15 is L3, and the distance between the retracted position and the extension position is S, S = L3. Therefore, when the piston rod 2 is at the extension position, the extension touch sensor 15 contacts with the extension limiting block 23 and is triggered to send out an extension limit signal to inform an operator that the hydraulic cylinder 100 is extended to the limit position, and damage caused by the fact that the hydraulic cylinder 100 is continuously in the extension state is avoided.

Further, the elongation touch sensor 15 includes a stopper rod 151, a touch sensor 152, and an elastic restoring member 153. The limiting rod 151 is provided with a driving end 1511 and a touch end 1512, and is rotatably arranged on the periphery of the cylinder barrel 1, and the driving end 1511 is arranged corresponding to the extension limiting block 23; the touch sensor 152 is disposed on the periphery of the cylinder 1 and corresponds to the touch end 1512 for outputting an extension limit signal when being touched, and when the piston rod 2 moves toward the extension position, the extension limit block 23 drives the limit rod 151 to rotate, so that the touch end 1512 rotates to touch the touch sensor 152; the elastic reset element 153 is disposed between the touch terminal 1512 and the touch sensor 152 for resetting the touch terminal 1512 from a position close to the touch sensor 152 to a position away from the touch sensor 152.

This scheme is through the setting of gag lever post 151 for touch sensor 152 sets up the position on cylinder 1 and can be more nimble, reduces the specification requirement to touch sensor 152, improves the commonality. In addition, the elastic reset element 153 is configured to automatically drive the touch end 1512 to a position away from the touch sensor 152. In this embodiment, the elastic restoring member 153 employs a compression spring.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims (10)

1. A hydraulic cylinder, comprising:

a cylinder barrel provided with a buckling part; and the number of the first and second groups,

the piston rod stretches and retracts along the axial direction of the cylinder barrel and moves in the hydraulic cavity of the cylinder barrel so as to have an extension position and a retraction position which are positioned at two ends of a movement stroke, the piston rod is provided with a matching part corresponding to the buckling part, when the piston rod moves towards the retraction position, the buckling part can be buckled with the matching part so as to limit the retraction of the piston rod, and when the piston rod moves towards the extension position, the buckling part is separated from the matching part.

2. The hydraulic cylinder according to claim 1, wherein the matching portion comprises a limiting plate and a mounting plate bent from one end of the limiting plate, the mounting plate is connected with the piston rod, the limiting plate is located on the outer side of the cylinder barrel and is arranged along the axial direction of the cylinder barrel, and a limiting hole penetrates through the limiting plate towards the cylinder barrel;

the buckling part comprises a buckling piece located on the inner side of the limiting plate, the buckling piece is arranged corresponding to the limiting hole and is arranged on the periphery of the cylinder barrel in a rotating mode around the width direction of the limiting plate, an elastic resetting piece is arranged between the buckling piece and the cylinder barrel, and the elastic resetting piece can be used for driving the buckling piece to rotate into the limiting hole;

when the piston rod moves towards the contraction position to the position, corresponding to the limiting hole, of the buckling piece, the elastic resetting piece drives the buckling piece to rotate to the position, connected in the limiting hole in an inserting mode, and when the piston rod moves towards the extension position, the limiting plate can drive the buckling piece to rotate to the position, separated from the limiting hole.

3. The hydraulic cylinder of claim 2, wherein a distance between the retracted position and the extended position is S, the length of the limit plate is L0, and S ≦ L0;

when the piston rod is in the contraction position, the distance between the limiting hole and the buckling piece is L1, and L1 is larger than or equal to 0.5S and smaller than or equal to S.

4. The hydraulic cylinder according to claim 3, wherein a plurality of the stopper holes are provided, and the plurality of the stopper holes are arranged at intervals in an axial direction of the piston rod.

5. The hydraulic cylinder according to claim 4, wherein the arrangement length of the plurality of limiting holes is L2, and L2 is greater than or equal to 0.3S and less than or equal to 0.5S.

6. The hydraulic cylinder of claim 2, wherein the engaging portion further comprises an actuating handle, the actuating handle is drivingly connected to the engaging member and is located laterally of the position-limiting plate in the width direction for driving the engaging member to rotate when an external force is applied.

7. The hydraulic cylinder of claim 2, wherein the mounting plate is pivotally connected to the piston rod about its width;

the periphery of the cylinder barrel is provided with a limiting frame corresponding to the limiting plate, the limiting frame is arranged at two openings in the axial direction of the piston rod to form a limiting channel, and the limiting plate penetrates through the limiting channel.

8. The hydraulic cylinder according to claim 2, wherein a retraction stopper is provided at one end of the piston rod away from the cylinder;

the periphery of the cylinder barrel corresponds to the contraction limiting block and is provided with a contraction touch sensor, and when the piston rod is located at the contraction position, the contraction touch sensor is in contact with the contraction limiting block to output a contraction limit signal.

9. The hydraulic cylinder of claim 2, wherein the retainer plate is provided with an extension stopper;

an extension touch sensor is arranged on the periphery of the cylinder barrel corresponding to the extension limiting block, and when the piston rod is located at the extension position, the extension touch sensor is in contact with the extension limiting block to output an extension limit signal;

when the piston rod is at the contraction position, the distance between the extension limiting block and the extension touch sensor is L3, the distance between the contraction position and the extension position is S, and S = L3.

10. The hydraulic cylinder of claim 9, wherein the extension touch sensor comprises:

the limiting rod is provided with a driving end and a touch end and is rotatably arranged on the periphery of the cylinder barrel, and the driving end is arranged corresponding to the extension limiting block;

the touch sensor is arranged on the periphery of the cylinder barrel, corresponds to the touch end and is used for outputting an extension limit signal when the touch sensor is touched, and the extension limiting block drives the limiting rod to rotate when the piston rod moves towards the extension position so that the touch end rotates to touch the touch sensor; and the number of the first and second groups,

the elastic resetting piece is arranged between the touch end and the touch sensor and used for enabling the touch end to reset from the position close to the touch sensor to the position far away from the touch sensor.

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